p:after {content: "You need to register to read the full article."; color:#ff0000;}
<?xml version="1.0" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<title>CSS Example</title>
<style type='text/css'>
h1 {font-size:18pt;}
p {font-size:12pt;}
p.abstract:after {content: "You need to register to read the full article."; color:#ff0000;}
</style>
</head>
<body>
<h1>Beginning Web Programming</h1>
<p class="abstract">This book teaches you how to write HTML. </p>
</body>
</html>
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